ath9k: optimize ath9k_ps_restore
ath_hw_cycle_counters_update only needs to be called if the power state changes. Most of the time this does not happen, even when ps_usecount goes down to 0. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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